Mortgage Calculators UK

Explore Your Mortgage and Equity Release Options

Explore our online mortgage calculators to get a clearer understanding of your borrowing potential or how much equity you may be able to release from your property, all in just a few minutes.

Each calculator is tailored to your needs and requires just a few details, such as your income, deposit, existing property equity or financial commitments, depending on the option you choose.

Whether you’re buying your first home, remortgaging, moving home or wanting to explore your equity release options, the mortgage calculator tool for your needs can be found below.

Mortgage Calculator Tools

Explore our mortgage calculator tools, with support available from our fee-free mortgage advisers afterwards.

First-Time Buyer Mortgage Calculator

Buying your first home? Get an estimate of how much you could borrow and start exploring your mortgage options.

Estimate My First-Time Buyer Borrowing →

Mortgage Borrowing Calculator

Estimate how much you could borrow for a mortgage based on your income and financial commitments.

Estimate My Borrowing Power →

Remortgage Calculator

Explore your borrowing potential when remortgaging your existing property.

Estimage My Remortgage Borrowing →

Moving Home Mortgage Calculator

Discover how much you could borrow towards your
next home.

Estimate My Next Mortgage →

Self-Employed Mortgage Calculator

Get an estimate of how much you could borrow by entering a few details about your self-employed income and circumstances.

Estimate My Self-Employed Borrowing →

Equity Release Calculator

Estimate how much equity you may be able to release from your home.

Estimate My Equity Release →

Your First Home Scheme Mortgage Calculator

Explore what your mortgage and deposit could look like under the government’s Your First Home scheme.

COMING SOON.

Expert Reviewed

Gerard Boon
Managing Director | B.A Hons, CeMAP, CeRER

Last Reviewed: 29.10.26

View Expert Profile →

Choose Your Mortgage Calculator

Select the calculator that best matches your circumstances, whether you're buying, remortgaging, moving home or exploring equity release options.

Enter Your Details

Provide the information requested, such as your income, financial commitments, existing equity or property value, depending on the calculator.

Review Your Estimate

Once you've provided the required details, you'll receive an initial calculation based on the information entered and one of our fee-free advisers will be in touch.

Remember, your calculator result is an estimate, not a guaranteed mortgage offer. Our fee-free mortgage advisers can review your circumstances, help you understand your borrowing options in more detail and, where appropriate, arrange an Agreement In Principle when you’re ready.

Contact a Mortgage Broker

Want to understand how much you could borrow?

Learn how lenders assess your income, outgoings and affordability in our mortage borrowing guide.

Read Our Mortgage Borrowing Guide →

Have a question?
Ask our fee-free mortgage advisers.

Every mortgage journey is different, and a calculator can’t tell you everything you need to know – that’s where our experienced mortgage advisers come in.

They understand lender criteria, mortgage schemes and the finer details that can make a difference to your options.

Simply submit your question to us and a member of our team will get back to you with personalised, fee-free guidance.

Real People. Expert Mortgage Advice.

Get to know the advisers behind our fee-free mortgage, protection and equity release service.

Meet Our Team →

Frequently Asked Questions

What Is a Mortgage Calculator?

A mortgage calculator is an online tool that helps you estimate how much you could borrow for a mortgage. At Boon Brokers, our calculator uses your annual income, deposit or existing equity, financial commitments and preferred mortgage term to estimate your potential borrowing amount.

Are Mortgage Calculators Accurate?

Mortgage calculators can provide useful estimates and are a great starting point, but their accuracy is only as accurate as the information entered. As such, they won’t be able to account for every lender's affordability criteria, fees or individual mortgage requirements, so the results should be treated as an indication rather than a guaranteed figure.

Can a Mortgage Adviser Help Me Understand My Calculator Results?

Yes, a mortgage adviser can explain your calculator results and help you understand how much you could realistically borrow. At Boon Brokers, our fee-free mortgage advisers can compare suitable mortgage options, explain the associated costs and guide you through your borrowing options based on your financial circumstances.

How Do I Calculate Interest on a Mortgage?

To estimate your mortgage interest for a year, multiply your outstanding mortgage balance by the annual interest rate. For example, a £250,000 mortgage at 5% interest would accrue approximately £12,500 in interest over a year if the balance remained unchanged. Most lenders calculate interest daily, so the actual amount depends on your outstanding balance and repayment schedule.

Which Mortgage Calculator Should I Use?

The right mortgage calculator depends on your circumstances and the type of mortgage you're considering. At Boon Brokers, we offer calculators for first-time buyers, home movers, remortgaging, self-employed applicants and lifetime mortgages, helping you estimate your borrowing potential based on your individual needs.

How Do Lenders Calculate How Much I Can Borrow for a Mortgage?

Mortgage lenders calculate your borrowing potential by assessing your income, monthly expenses, existing debts and other financial commitments. Most lenders typically use an income multiplier of around 4.5 to 5 times your annual earnings, although some may offer up to 6 times your income, depending on the mortgage product, your financial circumstances and the lender's eligibility criteria.

What Types of Income Count Towards My Mortgage Borrowing Limit?

Mortgage lenders typically consider basic salary, self-employed earnings and certain additional income sources, such as overtime, pensions, benefits, bonuses and commission. However, lenders assess these earnings differently, with some accepting the full amount and others only considering a proportion when calculating your borrowing limit.

Our mortgage calculators provide estimates for guidance only. Results are not guaranteed and do not constitute a mortgage offer. Actual borrowing amounts and eligibility will depend on your individual circumstances and the lender’s criteria.

Mortgage Calculators